Why do I get nauseous after a long run?

The following article from Runners World is very interesting regarding this question.



8 Why do I feel nauseated after a long run?
You put in 18 miles to be able to eat a burrito, not to feel pukey thinking about one. Blame the decreased appetite on chemistry; a 2008 study published in the American Journal of Physiology found that a 60-minute session of treadmill running increased the amount of the gut hormone peptide YY, an appetite suppressant, and suppressed acylated ghrelin, an appetite stimulant. Full-on nausea? "There's a good probability you haven't fueled properly during the run," says Ilana Katz, M.S., R.D., C.S.S.D., a sports nutritionist in Atlanta. A lack of fuel in your body sends it into a stressed mode, that fight-or-flight mentality where survival—not eating rice, beans, and guac—is key.
Running Rx Try to prevent the problem by taking in about 60 grams of carbs per hour, either through a sports drink, gel, or regular food during your run. "The body can process about one gram of carbs per minute," says Katz. Postrun, try to knock back something easy, like a recovery drink, within 30 minutes. If you can't eat right away, don't worry too much. "Appetite loss is typically short-lived," says Katz. "Within an hour or two, suddenly you'll have a major one."

Source - http://ping.fm/D64k6